IST Lunch Bunch

We present an interactive animation editor for complex deformableobject animations. Given an existing animation, the artist directlymanipulates the deformable body at any time frame, and the surroundinganimation immediately adjusts in response. The automatic adjustmentsare designed to respect physics, preserve detail in both the inputmotion and geometry, respect prescribed bilateral contact constraints,and controllably and smoothly decay in spacetime. While the utility ofinteractive editing for rigid body and articulated figure animationsis widely recognized, a corresponding approach to deformable bodieshas not been technically feasible before. We achieve interactive ratesby combining spacetime model reduction, rotation-strain coordinatewarping, linearized elasticity, and direct manipulation. This directediting tool can serve the final stages of animation production, whichoften call for detailed, direct adjustments that are otherwise tediousto realize by re-simulation or frame-by-frame editing.